CVE-2026-97598

Network-configuration stall via unbounded routing-table search

Published Sep 25, 2026 · Updated Sep 25, 2026

Algorithmic-complexity denial of service in the Linux IPv4 FIB allows local users to stall network configuration via a table-0 rule. fib_empty_table() scans successive table IDs in a 256-bucket hash while holding RTNL, causing each probe to traverse progressively longer chains. Exploitation requires CAP_NET_ADMIN and a densely populated table-ID space; the resulting delay blocks other RTNL-protected networking operations.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Algorithmic-complexity denial of service in the Linux IPv4 FIB allows local users to stall network configuration via a table-0 rule. fib_empty_table() scans successive table IDs in a 256-bucket hash while holding RTNL, causing each probe to traverse progressively longer chains. Exploitation requires CAP_NET_ADMIN and a densely populated table-ID space; the resulting delay blocks other RTNL-protected networking operations.

The record

CVE
CVE-2026-97598
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.19
  2. Affected versionversion=b801f54917b7c6e8540f877ee562cd0725e62ebd <2c29c053a6627dc4f12fcfe6b4860bcd9e5d7503
  3. Affected versionversion=b801f54917b7c6e8540f877ee562cd0725e62ebd <bc8d01d856db106f284b19961af6112e10c3e3b4
  4. Affected versionversion=b801f54917b7c6e8540f877ee562cd0725e62ebd <efdfb1e27a3328085b79540dfe781d537b576ea1
  5. Affected versionversion=b801f54917b7c6e8540f877ee562cd0725e62ebd <fe9a906d2bff2d2707bafd6353b5e032a42aeb35

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.19; version=b801f54917b7c6e8540f877ee562cd0725e62ebd <2c29c053a6627dc4f12fcfe6b4860bcd9e5d7503; version=b801f54917b7c6e8540f877ee562cd0725e62ebd <bc8d01d856db106f284b19961af6112e10c3e3b4; version=b801f54917b7c6e8540f877ee562cd0725e62ebd <efdfb1e27a3328085b79540dfe781d537b576ea1; version=b801f54917b7c6e8540f877ee562cd0725e62ebd <fe9a906d2bff2d2707bafd6353b5e032a42aeb35

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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